Air is blown onto a sail attached to a boat from an electric fan placed on the boat. Will the boat start moving?
(B) No,the boat will not move. According to Newton's $3^{rd}$ Law of Motion,when the air from the fan pushes the sail,the sail exerts an equal and opposite force on the fan. Since the fan is attached to the boat,the system (fan + boat) experiences internal forces that cancel each other out. Motion occurs only when an external unbalanced force acts on a body. Since the fan is part of the boat,no net external force is applied to the system,and therefore,the boat will not move.
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